Helmet



FIG. 1 is a top, front, right side perspective view of a helmet showing a first embodiment of our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a top, front, right side perspective view of a second embodiment thereof;

FIG. 9 is a front elevation view of FIG. 8;

FIG. 10 is a rear elevation view of FIG. 8;

FIG. 11 is a left side elevation view of FIG. 8;

FIG. 12 is a right side elevation view of FIG. 8;

FIG. 13 is a top plan view of FIG. 8; and,

FIG. 14 is a bottom plan view of FIG. 8.

The broken lines illustrate portions of the helmet that form no part of the claimed design. 

CLAIM The ornamental design for a helmet, as shown and described. 